Blowing-engine or compressor.



No 894,85. PATENTED AUG. 4-, 1908.

' G. B. PETSGHE.

BLOWING ENGINE 0R COMPRESSOR A PPLIOATH IN' FILED APR. 23, 1903.

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ii W 0; B. PETSOHE.

BLOWING ENGINE 0R COMPRESSOR. APPLICATION FILED APR. 23, 1903.

@6666; I I v v Q Jkz/g/iiv PATENTED AUG; 4, 1908'.

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UNITED STATES PATENT OFFICE.

GUSTAV BERNHARD PEISOHE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO SOUTH WARK FOUNDRY & MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPO- RATION OF PENNSYLVANIA;

BLOWING-ENGINE OR COMPRESSOR.

Specification of Letters Patent.

Patented Aug. 4., 1908.

To all whom it may concern:

Be it known that I, GUSTAV BERNHARD PETsoHE, a subject of the Emperor of Germany, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improvement in Blowing- Engines or Oo1npressors, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to air compressors or blowing engines and has for its object to simplify and improve the valve actuating mechanism forming a part of such engines.

The nature of my improvements will be best understood as described in connection with the drawings in which they are illus trated, and in which Figure 1 is a side elevation of a horizontal blowing engine embodying my invention. Fig. 2 is an end elevation of the air compressor showing the valve connections therewith. Fig. 3 is a horizontal section through the com ressing cylinder taken on the line 33 of ig. 1, and Fig. 4 is a section on the line 44 of Fig. 3.

A, indicates the actuating steam cylinder of the engine which is shown as provided with valves of the Corliss type.

B, is the piston rod, C, the connecting rod,

I at i, and which, by appropriate connections,

actuates the valves of the steam cylinder. The arms of the rock lever I, are coupled through connecting rods J, and J, with sliding reciprocating rods indicated at K, and K, the rod K, having, secured to it the cam blocks indicated at L, and Z, and the rod K,

having secured to it the cam blocks indicated at L, Z. The cam blocks L, Z, move in guideways indicated at M, M; m, m, indicating the back bearings for the said cam blocks, and the cam blocks L, Z, move in guideways indicated at M, M; m, m, indicating the back bearings for these blocks.

N, indicates the compressing cylinder having, as usual, admissiomand exhaust ports at both ends.

O, isthe compressing piston and O", the piston rod connecting said piston with the piston of the steam cylinder.

P, Fig. 3, indicates the delivery valve at one end of the-cylinder and P, the admission valve at the other end of the cylinder, the said cylinder having two admission and two delivery valves situated directly opposite to each other.

. h, and h, indicate the valve rods of the valves P, and P.

Q, is a piston secured on the end of the piston rod h, and having an annular projection Q, from its rear face, the said piston moving in a cylinder Q having an annular opening Q, in its rear head corresponding in size and alinement with the projection Q; also projecting from the rear face of the piston, are arms, indicated at Q, which support a bearing pin Q which, in turn, supports a cam roller indicated at Q. As indicated in Fig. 1, the rear head of the cylinder Q has a restricted orifice indicated at Q g indicating an escape pipe leading from said orifice. Passing now to the mechanism connected with the admission valves, it will be seen, see Fig. 3, that the valve rods h are connected with rock levers, indicated at R, turning on bearing pins R, said rock levers carrying on their arms the cam rollers R R which rest in contact with the cam faces of the blocks L, Z, attached to the reciprocating rod K S, S, (Figs. 1, and 2,) indicate pipes connecting the front ends of the cylinders Q Q with the inside of the compressing cylinder M, as is well indicated in Fig. 1; S, S, indicating non-return valve connections, such, for instance, as are also shown in the patent to Helander & Lindroth No. 616,667 of December 27, 1898.

T, T, T, indicate parts of the receiver of the blowing engine, the parts T, T, extending over the delivery valves and connecting together through the chamber T.

It will be obvious that the motion of the engine is transmitted to the shaft and from the shaft to the rock lever I, which, in turn,

communicates reciprocating movements in alternately op osite directions to the rods K, and K, and tirough the rod K, to the cam 'blocks L, and l, which operate in connection with the delivery valves, while through the rod K, the motion is communicated to the cam blocks L, Z, which operate in connection with the admission valves. The cam blocks L, Z, operating on the rock levers R, cornmunieate positive, though intermittent, motion to the admission valve while the cam blocks L, Z, operating through the cam rollers Q act upon the pistons Q, and through them upon the delivery valves, only in a direction to close said valves, the opening of the admission valves being effected through the cylinders Q into which the air from thecompressing cylinder N, is forced by the piston O, advancing toward the admission valve, the air passing through the conduit S, and gradually building up pressure against the piston Q, which pressure is communicated through the valve stem h, to the delivery valve P. Said delivery valve is, however, arranged, as shown in Fig. 3, with its back exposed to the pressure of the air in the receiver and is consequently held to its seat by a pressure equal to the difference in the pressures inthe receiver and in the compressing cylinder. Acting on a valve of such large area, as is the delivery valve, this pressure holds the valve to its seat with great force, the frictional resistance developed being so great that the valve does not move under the gradually building up pressure acting on the piston until the increasing pressure in the compressing cylinder is substantially equal to that in the receiver, under which condition the frictional resistance holding the valve to its seat disappears and the valve moves with great energy and rapidity under the influence of the piston Q, the cam blocks L, or Z, being timed in their movement so as to permit the free outward movement of the piston at the time above indicated.

In view of the very considerable weight of the delivery valves and the rapidity with which they move in opening, it is necessary that their motion should be cushioned in order to prevent destructive shocks at the end of their opening stroke, and it is for this purpose that I provide the opening Q, in the rear of the cylinder and the projection Q, in the rear of the piston, this construction enabling the air to escape freely from the cylinder at the beginning of the movement of the valve, and checking the escape when the projection Q, enters the opening Q, the end of the opening stroke of the piston being cushioned on the air thereafter confined in the cylinder while the escape of this air is permitted through a restricted orifice such as is indicated at Q Each cam block is secured in place on its rod by nuts K By adjusting these nuts each cam block may be adjusted relatively to its supporting rod and the other cam blocks.

In its general system of operation, my improved blowing engine does not diller from older constructions well known in the art, my invention being confined exclusively to the simplification of the apparatus ell'ecting the motion of the valves, with the special object in view of diminishing the number and com plexity of the parts, and especially of elleeting the positive movements which should be, given to the valves with great accuracy and by means which are least liable to disorder, results which are primarily secured by the utilization of reciprocating cams and the simple devices by which such cams are connected together and to the actuating devices operated by the engine.

Having now described .my invention, \vha t I claim as new and desire to secure by Lettors Patent is,

1. In a compressor or blowing engine, the combination of a cylinder, a delivery valve at each end of the cylinder, means for opening each valve when the pressure in the corresponding end of the cylinder reaches a desired point, a valve closing part for each valve movable in a plane transverse to the axis of each cylinder, a rod. movable parallel to the axis of the cylinder, a pair of cam blocks one for each valve closing part, carried by said rod, means for independently adjusting each block relative to the other and the rod, bearings for the blocks and means for reciprocating said rod to cause each valve closing part to be engaged by its cam block and close its valve at the end of the corresponding compressing stroke of the compressing piston.

2. In a compressor, or blowing engine, a cylinder, a delivery and admission valve at each end 01 the cylinder, a valve operating part for each. valve movable transversely to the axis of the cylinder, all of said parts extending to one side ol' the cylinder, a pair of rods at said one side of the cylinder and extending parallel to the axis thereof, a link having its ends pivotally connected to said rods and l'ulcrumed between its ends, means for oscillating said link about its fulcrum to reciprocate each rod, in. the direction of its length, cams carried by one of said rods for engaging the valve operating parts of the admission valves to positively open and close said valves, cams carried by the other of said rods for engaging the valve operating parts of the delivery valves to close said valves, each cam being secured to its carrying rod by means permitting the adjustment of the cam along the length of the rod, and separate means for opening each delivery valve when the pressure in the corresponding end of the cylinder reaches a desired point.

3. In a compressing or blowing engine, the

combination of delivery valves controlling a ports leading from the compressing cylinder and having their backs exposed to the pressure in the receiver, with actuating cylinders for opening the delivery valves, pistons working in said cylinders and connected to the delivery valves, said pistons supporting cam contacting devices, as roller Q on their outer faces, outer heads for the valve actuating cylinder supporting guideways M, for slide blocks, cam slide blocks movable in said guideways and arranged to act through rollers Q, to close the delivery valves, and positively actuated reciprocating rods moving parallel to the axial line of the cylinder connected to actuate the cam blocks.

4. In a compressing or blowing engine, the combination of delivery valves controlling ports leading from the compressing cylinder and having their backs exposed to the pressure in the receiver, with actuating cylinders for opening the delivery valves, pistons working in said cylinders and connected to the delivery valves, said pistons supporting cam contacting devices, as roller Q, on their outer faces, outer heads for the valve actuating cylinder supporting guideways M, for cam slide blocks, and acting in connection with the rear face of the piston to cushion the opening movement of the valve and.

its connections, cam slide blocks movable in said guideways and arranged to act through rollers Q, to close the delivery valves, and positively actuated reciprocating rods moving parallel to the axial line of the cylinder connected to actuate the cam blocks.

GUSTAV BERNHAItl) PETSCHE.

Witnesses:

JosEPH F. ONEILL, D. STEWART. 

